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Knowledge of rowing between students of Faculty of Physical Education and Sport, Charles University and Faculty of Physical Culture Palacký University Olomouc
Richterová, Nikol ; Janák, Vladimír (advisor) ; Kozák, Martin (referee)
Title: Knowledge of rowing between students of Faculty of Physical Education and Sport - Charles University and Faculty of Physical Culture - Palacký University Olomouc Objectives: The main objective of this work is research on the extent of knowledge about rowing of the students of two sports-oriented university faculties. Another aim is to compare general knowledge of students and comparison of the two selected faculties Methods: To determine the necessary information was used quantitative research, using on-line interviews. Before the interview was modified a questionnaire on the given subject, which was planned for 100 respondents. The research was conducted using an electronic questioning when the questionnaire was completed 119 respondents from Faculty of Physical Education and Sport - Charles University and The Faculty of Physical Culture - Palacký University Olomouc Results: Based on the research results, it is possible to say that knowledge and awareness about the rowing is among respondents rather average. Approximately 75 % of the respondents knew the correct answer in three questions. But to another question stated the right answer only 12 % of respondents. After mutual comparison of the two faculties, it is possible to say that knowledge of rowing are comparable. Keywords: rowing,...
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Sum-frequency generation in far-UV spectral region
Martínek, Miroslav ; Kozák, Martin (advisor) ; Ondič, Lukáš (referee)
Nonlinear optics is the area of high field optics, where the dependence of polarization of matter on the electric field of optical radiation cannot be considered as linear. This has important implications for practise, since the superposition principle is no longer valid in nonlinear optics. Thus it is possible to influence light, propagating through material, by another intensive radiation. Nonlinear optical phenomena are important especially for laser technology because they allow to generate light at different wavelengths using various interactions. This thesis is focused on the study of the sum-frequency generation in the far ultraviolet (UV) region of the spectrum. As the radiation source the femtosecond laser system was used. The aim of the study was to theoretically describe generation by nonlinear wave equation and to calculate the dependence of phase-matching angle on generated wavelength. Theoretical results were then verified experimentally in the laboratory. Also the energy of generated pulses and sum-frequency generation efficiency were measured for pulses in spectral region 215-250 nm. The generated pulses will further serve to excite electron-hole pairs in the diamond.
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Studium optických nelinearit v polovodičích a polovodičových nanostrukturách
Kozák, Martin ; Trojánek, František (advisor) ; Herynková, Kateřina (referee) ; Kužel, Petr (referee)
This Ph.D. thesis is focused on the study of optical nonlinearities and dynamics of excited charge carriers in monocrystalline diamond, nanocrystalline diamond and silicon. The dynamics of high density carriers in bulk diamond is investigated in detail (the transition from excitons and free carriers to electron-hole liquid or plasma). We study the picosecond dynamics of electron-hole liquid condensation using several techniques of time-resolved optical spectroscopy and demonstrate its evaporation by femtosecond laser pulses. We also propose two new optical techniques for measurement of lifetime, diffusion coefficient and surface recombination velocity of excitons in diamond. The results obtained by these techniques are described theoretically using diffusion equation and compared with the results obtained by the transient grating diffraction measurement. Further we study two- and three- photon absorption and nonlinear refractive index in diamond. In nanocrystalline diamond we study the second and third harmonic generation and its physical origin. In superlattices of silicon nanocrystals in SiO2 matrix we investigate the nonlinear transient absorption dynamics and carrier diffusion.
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Time-resolved laser spectroscopy of nanomaterials
Kozák, Martin
Title: Time-resolved laser spectroscopy of nanomaterials: Study of nonlinearities using z-scan method Author: Martin Kozák Department: Department of chemical physics and optics Supervisor: Doc. RNDr. František Trojánek, Ph.D. Supervisor e-mail adress: Frantisek.Trojanek@mff.cuni.cz Abstract: This diploma thesis is oriented to study of nonlinear properties in semiconductor nanocrystals using ultrashort femtosecond pulses. There is a detailed description of theory and experimental setup of the z-scan method, which can be used to measure the nonlinear refractive index and two-photon absorption coefficient. In the theoretical part we describe the influence of measurement by quality of laser beam, quality and thickness of the sample. There are numerical simulations of measurements influenced by these parameters. This theory is used for processing of measured dates by a simple program, which is attached to this thesis on CD. In experimental part we were measured nonlinear refractive indeces of diamond nanocrystals fabricated by the PECVD method, silicon and CdS nanocrystals in glass matrices. One part of this thesis was also the preparation and optimalization of experimental setup and increasing the signal/noise ratio. Keywords: Z-scan, Kerr effect, nonlinear refractive index, two-photon absorption, nanocrystals
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Time-resolved laser spectroscopy of nanomaterials
Kozák, Martin ; Trojánek, František (advisor) ; Šimurda, Miroslav (referee)
This diploma thesis is oriented to study of nonlinear properties of semiconductor nanocrystals using ultrashort femtosecond pulses. There is a detailed description of theory and experimental setup of the z-scan method, which can be used to measure the nonlinear refractive index and the two-photon absorption coefficient. In theoretical part we describe the influence the quality of laser beam, quality and thickness of the sample on measurements. There are numerical simulations of the measurements influenced by these parameters. This theory is used for processing of the measured dates by a program, which is attached to this thesis on CD. In experimental part we measured nonlinear refractive indeces of diamond nanocrystals fabricated by the PECVD method, silicon and CdS nanocrystals in glass matrices. One part of this thesis deals with the preparation and optimalization of the experimental setup and increasing the signal/noise ratio.
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Changes of Czech rowing sport after 1989 - its structural changes and aims
Kozák, Martin ; Slepičková, Irena (advisor) ; Waic, Marek (referee)
Název: Vývoj Českého veslařského svazu po roce 1989 - strukturální změny a zaměření činnosti Title of Thesis: Development ofCzech Rowing Association after 1989 - structural changes and activity orientation Cíl práce: Cílem diplomové práce bylo zjistit a popsat důsledky politických, společenských, ekonomických a legislativních změn v České republice na činnost Českého veslařského svazu a veslařského sportu v České republice obecně. Metoda: Ke zjištění potřebných informací pro vypracování této diplomové práce jsem využil postup kvalitativního výzkumu. Provedl jsem rozhovory podle návodu s čelnými představiteli Českého veslařského svazu. Následně jsem provedl analýzu dokumentů získaných především na sekretariátu Českého veslařského svazu (dále jen ČVS). Ostatní dokumenty jsem získal v dalších organizacích a dále prostřednictvím internetu. Získané informace jsem doplňoval z neformálních rozhovorů s funkcionáři, pamětníky a jinými činovníky, kteří ve sledovaném období v ČVS působili. Výsledky: Z výsledků šetření vyplynulo, že ČVS je občanským sdružením ve smyslu zákona č. 83/1990 Sb., které svoji základní úlohu plní. V době zásadních transformačních změn se ČVS osamostatnil a dokázal se integrovat do nově vznikajících struktur českého sportovního prostředí. ČVS je právoplatným členem Mezinárodní...
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Web graphic knowledge base editor for expert system NEST
Kozák, Martin ; Zamazal, Ondřej (advisor) ; Berka, Petr (referee)
Main goal of this thesis is development of knowledge base editor designed to work online. Such editor would provide its user with all tools that are necessary to create and modify knowledge base in a graphic and user-friendly working environment. This editor is developed for system NEST (New Expert SysTem), which is an expert system developed on University of Economics, Prague. Created editor is named WEBZ it is created as a web application. WEBZ is written in Java and build on Vaadin framework. Vaaadin is a framework created to develop web application while supporting a creation of graphic user interface. The thesis first chapter is a theoretical introduction into expert systems with a brief description of NEST. The description of NEST continues in second chapter, which is focused on a knowledge base of this expert system. In the following chapter, Vaadin framework is briefly described. The thesis continues with the comparison between WEBZ and its predecessors. Last two chapters are dedicated to description of WEBZ both from the perspective of user and from the perspective of developer.
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